Hydrothermal synthesis of Mg-rich and Mg-Ni-rich kaolinite

被引:26
作者
Bentabol, Maria
Ruiz Cruz, Maria Dolores [1 ]
Javier Huertas, Francisco
Linares, Jose
机构
[1] Univ Malaga, Dept Quim Inorgan Cristalog & Mineral, Fac Ciencias, E-29071 Malaga, Spain
[2] CSIC, Estac Expt Zaidin, E-18008 Granada, Spain
关键词
Al-rich serpentine; FTIR; hydrothermal synthesis; Mg-rich kaolinite; TEM/AEM; XRD;
D O I
10.1346/CCMN.2006.0540602
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mg-rich kaolinite and Mg+Ni-rich kaolinite have been synthesized in hydrothermal experiments (200 and 400 degrees C) from poorly crystalline kaolinite and Mg- and Mg+Ni-bearing solutions. Al-rich serpentine and Al-rich chlorite were obtained as sub-products of the reactions. The formation of these phases occurred through a dissolution-precipitation mechanism that led to spherical kaolinite after short reaction times. A morphological evolution towards platy particles and stacks occurred at increasing run times. Identification of the several phases was carried out using a combination of X-ray diffraction and transmission/analytical electron microscopy. Analytical data indicate that the Mg content in kaolinite increased as a function of the reaction time and temperature, reaching up to 0.46 atoms per half formula unit (a.p.h.f.u.). The measured (Mg+Ni) content reached up to 0.56 a.p.h.f.u.. Both the gradual increase of the b-cell parameter of kaolinite at increasing Mg contents and the presence of new bands on the FTIR spectra of the synthesized kaolinite point to a Mg-for-Al replacement in the octahedral sheet rather than to the presence of serpentine-like layers interstratified in the kaolinite structure.
引用
收藏
页码:667 / 677
页数:11
相关论文
共 35 条
[1]  
ANGEL BR, 1975, P INT CLAY C 1975, P297
[2]  
[Anonymous], MINERAL SOC LONDON M
[3]  
BAILEY SW, 1988, REV MINERAL, V19, P169
[4]  
BAILEY SW, 1984, MINERALOGICAL SOC MO, V5, P1
[5]   Chemical and structural variability of illitic phases formed from kaolinite in hydrothermal conditions [J].
Bentabol, M ;
Cruz, MDR ;
Huertas, FJ ;
Linares, J .
APPLIED CLAY SCIENCE, 2006, 32 (1-2) :111-124
[6]   RELATION BETWEEN STRUCTURAL DISORDER AND OTHER CHARACTERISTICS OF KAOLINITES AND DICKITES [J].
BRINDLEY, GW ;
KAO, CC ;
HARRISON, JL ;
LIPSICAS, M ;
RAYTHATHA, R .
CLAYS AND CLAY MINERALS, 1986, 34 (03) :239-249
[7]   CHEMICAL AND X-RAY INVESTIGATION OF CHROMIFEROUS KAOLINITE (MILOSCHITE) FROM GEYSERS, SONOMA COUNTY, CALIFORNIA [J].
BROOKINS, DG .
CLAYS AND CLAY MINERALS, 1973, 21 (05) :421-422
[9]  
Deer W.A., 1976, ROCK FORMING MINERAL, V3
[10]   FTIR REFLECTANCE VS EPR STUDIES OF STRUCTURAL IRON IN KAOLINITES [J].
DELINEAU, T ;
ALLARD, T ;
MULLER, JP ;
BARRES, O ;
YVON, J ;
CASES, JM .
CLAYS AND CLAY MINERALS, 1994, 42 (03) :308-320